Use max_cpus = sysconf(_SC_NPROCESSORS_CONF) to determine the number of
the maximum CPU (+1).
The cpu_for_thread_*() functions check the first max_cpus bits
in the cpuset / cpumask.
This fixes failing to set the affinity to CPUs >= num_online_cpus,
if some intermediate CPU is offline, e.g. on an AMD system
with nosmt.
Signed-off-by: Jonathan Schwender <schwenderjonathan@xxxxxxxxx>
---
src/cyclictest/cyclictest.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index f38c453..b104e4c 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -1741,7 +1741,8 @@ int main(int argc, char **argv)
int signum = SIGALRM;
int mode;
int cpu;
- int max_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+ int max_cpus = sysconf(_SC_NPROCESSORS_CONF);
+ int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
int i, ret = -1;
int status;
@@ -1750,8 +1751,10 @@ int main(int argc, char **argv)
if (check_privs())
exit(EXIT_FAILURE);
- if (verbose)
+ if (verbose) {
printf("Max CPUs = %d\n", max_cpus);
+ printf("Online CPUs = %d\n", online_cpus);
+ }
/* Restrict the main pid to the affinity specified by the user */
if (affinity_mask != NULL) {
--
2.29.2
